Balanced piston-valve



G. W. BAKER AND G. WILLIAMS. BALANCED PISTON VALVE. APPLICATION flLED FEB. 14, 1920.

' (Imam/044 auovmu o Patented June 8, 1920..

2 SHEETSSHEET l- I G. W. BAKER AND G. WILLIAMS.

BALANCED PISTON VALVE.

APPLICAHON FILED FEB. 14, 1920.

1,343, 105., I Patented June 8, 1920:

2 SHEETSSHEET 2. j

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GEORGE W, BAKER, OF MAYTOVVN, AND GEORGE WILLIAMS, OF WYANO, PENNSYL- VANIA.

BALANCED PISTON-VALVE.

Specification of Letters Patent.

Patented June 8, 1920.

Application filed February 14, 1920. Serial No. 358,571.

To all whom it may concern:

Be it known that we, GEORGE W. BAKER and Gnonen VVILLIAMs, citizens of the United States, residing at Maytown and lVyano, 1n the counties of Lancaster and Westmoreland, State of Pennsylvania, have invented a new and useful Balanced Piston-Valve, of which the following is a specification.

The device forming the subject matter of this application is a valve for a steam engine, or for an engine operated by some fluid other than steam, and the inventlon aims to provide a valve of the kind mentioned, which will be thoroughly andadequately balanced, so far as pressure within the valve chest is concerned.

The invention aims to provide novel means whereby the valve will be lubricated during its reciprocation.

Another object of the invention is to provide a valve of the sort alluded to which will withstand long continued use and remain operative without frequent renewals or repairs.

It is within the province of the disclosure to improve generally and to enhance the utility of devices of that type to which the 111- vention appertains.

lVith the above and other objects in view, which will appear as the description proceeds, the invention resides in the combination and arrangement of parts and in the details of construction hereinafter described and claimed, it being understood that, within the scope of what is claimed, changes in the precise embodiment of the invention shown can be made without departing from the spirit of the invention.

In the accompanying drawings Figure 1 shows in vertical section, a device constructed in accordance with the invention, parts appearing in elevation; Fig. 2 is an elevation disclosing the valve per cc, Fig. 3 is a longitudinal section 01 the valve; Fig. 4 is a cross section on the line 41-41 of Fig. 1; Fig. 5 is a cross section on the line 5-5 of Fig. 1; and Fig. 6 is an elevation showing one-half of the valve, the inner surface of the said valve being exposed.

The numeral 1 denotes the cylinder of a steam engine on which is mounted a valve chest 2. The chest 2 includes a cylindrical part 3 and heads 4 having glands 5. Guides 6 are extended longitudinally of the chest 2 in the interior thereof, the guides 6 being dove-tailed as indicated at 7 into the side walls of the chest 2. The heads 4 are provided with recesses 8 wherein the ends of the guides 6 are received, the structure being strengthened accordingly. The body 3 of the chest is provided with ports 9 whereby steam is admitted to the chest. From the chest 2, the steam passes by way of ports 10 into the cylinder 1. The exhaust steam leaves the cylinder 1 by way of the ports 10 into the valve chest 2 and passes from the chest 2 by exhaust ports'l1all of the foregoing comprising a common and well known arrangement of ports in a device of this kind.

The numeral 12 denotes a valve mounted for reciprocation in the chest 2. The valve 12 is a compound structure and comprises a pair of trough-shaped members 14 having outstanding flanges 15 mounted to slide on the guides 6. Those edges of the flanges 15 which are adjacent to the wall of the valve chest 1 are provided with oil ducts 16 projecting inwardly in opposite direction, the ducts 16 being extended beyond the longitudinal center of the flange 15, so that oil may be delivered properly between the flange 15 and the wall of the chest 2 without, however, permitting leakage of steam. Those surfaces of the flanges 15 which cooperate with the guides 6 are provided with oil ducts 17, and it will be seen that, owing to the cooperation between the ducts 16 and 17, adequate lubrication is provided both at the places where the flanges 15 slide on the guides 6 and at the places where the flanges 15 are in slidable contact with the wall of the valve chest 2.

The members 14 of the valve 12 are provided with end walls 18 which outstand as shown at 23 for slidable contact with the wall of the valve chest 2, the outstanding portions 23 of the members 14 serving to define a circumscribing external recess 24 on the valve 12. The end walls 18 of the members 16 are provided with cooperating openings 19. The walls 18 are supplied with outstanding flanges 20, projecting longitudinally of the valve. Each member 14 of the valve is supplied internally, at a point midway between its ends, with a reinforcing partition 21, the partitions 21 having an opening 22. End pieces 25 are received within openings 19 and include heads 26 received within the contour of the flanges 20. The end pieces 25 are supplied with ports 27 to establish communication between the interior of the valve and the chest 2 at the ends of the valve. The numeral 28 denotes a valve rod, the intermediate portion of which is received in the openings 22 of the partitions 21, the valve rod having shoulders 29 against which the end pieces abut. The valve rod 28 has other shoulders 30 against which castle nuts 31 abut, the castle nuts being held in place by cotter pins 32 extended through the rod 28. The rod 28 embodies reduced ends 33 slidable in the glands 5.

In practical operation, the steam in the ends of the chest 2 will find its way within the valve 12, through the ports 27 in the end pieces 25. Similarly, the exhaust will find its way entirely around the valve, owing to the presence of the circumscribing recesses 24a. The valve, therefore, will be adequately and perfectly balanced, so far as internal pressure in the chest 2 is concerned. The guides '6 cooperate with the flanges 15 and the guides coact with the heads 4 of the chest 2 in such a way that leakage of steam will be avoided.

Having thus described the invention, what is claimed is 1. In a device of the class described, a valve chest; guides extended longitudinally of the chest; a valve comprising troughshaped members between which the guides are located, the members of the valve being reduced in diameter intermediate their ends to define a circumscribing external recess on the valve, and end pieces within the trough-shaped members, the end pieces having ports establishing communication between the ends of the valve chest and the interior of the valve; and a rod mounted in the end pieces of the valve. 7

2. A device of the class described, constructed as set forth in claim 1, and further characterized by the fact that those edges of the members of the valve which are adjacent to the chest are provided with transverse inwardly extended oil ducts disposed in alternating order, those edges of the members of the valve which cooperate with the guides being provided with transverse oil ducts.

3. In adevice of the class described, a valve chest comprising a body and heads on the body; guides extended longitudinally of the body, the guides being dovetailed into the body, the ends of the guides cooperating with the heads; a valve comprising trough-shaped members between which the guides are located, the members of the valve being reduced in diameter intermediate their ends to define a circumscribing external recess in the valve, the valve including end pieces received within the troughshaped members, the end pieces hav ing ports establishing communication between the ends of the chest and the interior of the valve; and a rod whereon the end pieces are mounted.

In testimony that we claim the foregoing as our own, we have hereto affixed our signatures in the presence of two witnesses.

GEORGE W. BAKER. GEORGE WILLIAMS. Witnesses: 7

JAMES C. CRAWFORD, HENRY A. MoGrowAN. 

